US8126998B2 - Information processing apparatus and method of controlling thereof - Google Patents

Information processing apparatus and method of controlling thereof Download PDF

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US8126998B2
US8126998B2 US12/533,637 US53363709A US8126998B2 US 8126998 B2 US8126998 B2 US 8126998B2 US 53363709 A US53363709 A US 53363709A US 8126998 B2 US8126998 B2 US 8126998B2
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wireless
base station
wireless base
wireless terminal
information
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US20100049844A1 (en
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Nobuhiro Ikeda
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Canon Inc
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Canon Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H04L67/125—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks involving control of end-device applications over a network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/04—Protocols specially adapted for terminals or networks with limited capabilities; specially adapted for terminal portability

Definitions

  • the present invention relates to a technique for identifying a wireless device not targeted for management in a wireless communication network.
  • Universal Plug and Play is available as a discovery technique for detecting device capability in a network.
  • a standard protocol such as LLDP (Logical Link Discovery Protocol) has been defined by IEEE 802.1ab in recent years in order to detect the devices constituting a network.
  • LLTD Link Layer Topology Discovery
  • UPnP the standardization of image transmission technologies that take QoS (Quality of Service) into account is proceeding in order to enhance the audio/visual (AV) function, namely the reproduction of audio and video in the system.
  • AV audio/visual
  • Japanese Patent Laid-Open No. 2003-324449 discloses a technique whereby a wireless communication terminal constituting a network that receives accommodated-terminal (system load) information from an access point device and generates a neighbor AP information table.
  • the wireless communication terminal refers to the neighbor AP information table and selects the optimum access point device; therefore, this technique is capable of distributing the processing load of the access point device and distributing the traffic in the wireless network.
  • Japanese Patent Laid-Open No. 2005-094157 discloses a technique whereby a plurality of wireless communication terminals constituting a network that acquire identification information about other wireless communication terminals and transmits this identification information about the other wireless communication terminals to a wireless communication terminal accommodating apparatus.
  • the wireless communication terminal accommodating apparatus senses the presence of a plurality of wireless communication terminals based upon the identification information of the wireless communication terminals, generates information indicating this relationship and ascertains the network topology of the overall wireless communication system.
  • Japanese Patent Laid-Open No. 2005-311576 discloses a technique whereby network topology management for a path search is implemented using identifiers of wireless communication terminals, the search being conducted among a plurality of wireless communication terminals that constitute an adhoc network.
  • identifiers of a plurality of wireless communication terminals that are the target of a search in a network are included in a single path request message, and it is possible to perform path management for every wireless communication terminal by performing a broadcast within the network.
  • a wireless area subject to management cannot be identified in a case where even one wireless communication terminal (STA) is not associated with a wireless access point apparatus (AP) that does not support LLTD.
  • STA wireless communication terminal
  • AP wireless access point apparatus
  • an information processing apparatus for managing a wireless terminal and a wireless base station included in a wireless network, the apparatus comprises: an acquisition unit configured to acquire information, which relates to the wireless base station detected by the wireless terminal, from the wireless terminal; a storage unit configured to correlate and store the wireless base station detected by the wireless terminal and a wireless terminal wirelessly connected to this wireless base station, based upon the information acquired by the acquisition unit; a deriving unit configured to derive a wireless base station which does not have a wireless connection with a wireless terminal, based upon the information stored by the storage unit; a requesting unit configured to request a wireless terminal, which has detected the wireless base station derived by the deriving unit, for transmission of data that has passed through this wireless base station; and a determination unit which, if data requested by the requesting unit that has passed through the wireless base station from the wireless terminal has not been received, is configured to determine that this wireless base station is a wireless base station that is not under management.
  • a method of controlling an information processing apparatus for managing a wireless terminal and a wireless base station included in a wireless network comprises: an acquisition step of acquiring information, which relates to the wireless base station detected by the wireless terminal, from the wireless terminal; a storage step of correlating and storing the wireless base station detected by the wireless terminal and a wireless terminal wirelessly connected to this wireless base station, based upon the information acquired at the acquisition step; a deriving step of deriving a wireless base station which does not have a wireless connection with a wireless terminal, based upon the information stored at the storage step; a requesting step of requesting a wireless terminal, which has detected the wireless base station derived at the deriving step, for transmission of data that has passed through this wireless base station; and if data requested at the requesting step that has passed through the wireless base station from the wireless terminal has not been received, a determination step of determining that this wireless base station is a wireless base station that is not under management.
  • a technique whereby a wireless device not under management in a wireless communication network can be rendered identifiable without this ability being influenced by whether or not a specific protocol is utilizable.
  • FIG. 1 is a diagram useful in describing a wireless communication system according to a first embodiment of the present invention
  • FIG. 2 is a block diagram illustrating the internal structures of a wireless terminal and management apparatus according to the first embodiment
  • FIGS. 3A and 3B are sequence diagrams for describing the operation of a network management apparatus 111 and wireless communication terminals 116 to 118 in the communication system according to the first embodiment;
  • FIG. 4 is a detailed block diagram illustrating a topology information acquisition unit 402 installed in a QoS middleware module 401 ;
  • FIG. 5 is a detailed block diagram illustrating a topology information management unit 412 installed in a QoS middleware module 411 ;
  • FIG. 6 is a flowchart useful in describing processing for generating a wireless related information management table
  • FIG. 7 is a diagram illustrating examples of wireless related information management tables generated by wireless communication terminals 116 to 118 ;
  • FIG. 8 is a diagram illustrating an example of a wireless related information management table generated by a management terminal 111 ;
  • FIG. 9 is a diagram exemplifying the format of an answer message
  • FIG. 10 is a flowchart useful in describing processing for updating a wireless related information management table
  • FIG. 11 is a diagram useful in describing transmission of a wireless related information answer message in a wireless communication system.
  • FIG. 12 is a diagram illustrating an example of a wireless related information management table after updating.
  • a management apparatus in a wireless network will now be described as a first embodiment of an information processing apparatus according to the present invention.
  • FIG. 1 is a diagram useful in describing a wireless communication system according to the first embodiment.
  • a small-scale network 100 is used in the home and is connected to an Internet service provider (ISP) 101 . There is also a small-scale network 103 different from the network 100 .
  • a network management apparatus 111 manages the network 100 .
  • Access point devices (wireless base stations) 112 and 113 are connected to the network 100 , and an access point device 114 is connected to the network 103 . That is, the access point devices 112 and 113 are under the management of the management apparatus 111 but the access point device 114 is not.
  • AP 1 is used as the SSID (network identification information) of the access point device 112
  • AP 2 is used as the SSID of the access point device 113
  • AP 3 is used as the SSID of the access point device 114 .
  • a display 115 with a built-in communication function is connected to the network 100 by wire.
  • Wireless communication terminals (STA) 116 to 118 are connectable wirelessly via an access point device.
  • the wireless terminals are a wireless surveillance camera 116 , a wireless HDR (hard-disk recorder) 117 and a wireless DVC (digital video camera) 118 .
  • FIG. 2 is a block diagram illustrating the internal structures of a wireless terminal and management apparatus according to the first embodiment.
  • a wireless terminal (STA) is shown on the left side of FIG. 2 and the management apparatus on the right side.
  • the wireless terminal includes a QoS middleware module 401 , which is a processing module for controlling communication quality (QoS) in accordance with a command from the management apparatus 111 .
  • QoS middleware module 401 includes a topology information acquisition unit 402 ; a database 403 ; a controller 404 ; a display unit 405 comprising an LCD or LEDs for notifying the user of error information and operating status; and an input unit 406 for accepting data input from a peripheral such as a keyboard or remote controller.
  • the wireless terminal further includes a UPnP processing unit 407 ; a TCP/UDP/IP processing unit 408 ; and a network controller 409 of a wireless or wired LAN. Information acquisition processing 410 is executed with respect to the network controller 409 .
  • the management apparatus includes a QoS middleware module 411 , which is a processing module for acquiring information from the wireless terminals and for controlling communication quality (QoS). Included in the QoS middleware module 411 are a topology information management unit 412 ; a database 413 ; a controller 414 ; a display unit 415 comprising an LCD or LEDs for notifying the user of error information and operating status; and an input unit 416 for accepting data input from a peripheral such as a keyboard or remote controller.
  • the management apparatus further includes a UPnP processing unit 417 ; a TCP/UDP/IP processing unit 418 ; and a network controller 419 of a wireless or wired LAN.
  • a message 420 is transmitted from the management apparatus to the client, and a message 421 is transmitted from the client to the management apparatus.
  • FIGS. 3A and 3B are sequence diagrams for describing the operation of the management apparatus 111 and wireless terminals 116 to 118 in the communication system according to the first embodiment.
  • FIG. 4 is a detailed block diagram illustrating the topology information acquisition unit 402 installed in the QoS middleware module 401 .
  • the topology information acquisition unit 402 includes a wireless related information generator 1100 , a wireless related information acquisition unit 1101 , a wireless related information updating unit 1102 and a message transceiver 1103 .
  • FIG. 5 is a detailed block diagram illustrating the topology information management unit 412 installed in the QoS middleware module 411 .
  • the topology information management unit 412 includes a wireless related information management unit 1201 , a management information analyzer 1202 , a wireless terminal selector 1203 , a device identification unit 1204 and a message transceiver 1205 . The operation and function of each of these components will be described with reference to the sequence chart set forth below.
  • the wireless terminals 116 to 118 are capable of verifying the presence of the access points 112 , 113 , 114 , which are areas that can be reached by radio waves, by executing processing for scanning (searching for) access point devices.
  • processing for scanning searching for
  • information that differs in dependence upon placement of terminals and installation environment is gathered by the wireless related information acquisition unit 1101 of topology information acquisition unit 402 installed in each of the wireless terminals 116 to 118 .
  • the items of wireless related information which are specific to the wireless terminals and are the result of the scan processing, are stored as a wireless related information acquisition table in the database 403 installed in each of the wireless terminals 116 to 118 .
  • FIG. 7 is a diagram illustrating examples of wireless related information management tables generated by the wireless terminals 116 to 118 .
  • Indicated at T 201 , T 202 and T 203 are a wireless related information acquisition table of the wireless surveillance camera 116 generated based upon the result of scan processing at A 818 in FIG. 3A , a wireless related information acquisition table of the wireless HDR 117 generated based upon the result of scan processing at A 819 , and a wireless related information acquisition table of the wireless DVC 118 generated based upon the result of scan processing at A 820 , respectively.
  • the wireless related information that constitutes the tables generated by execution of the scan processing in the wireless terminals 116 to 118 is managed for every access point device in the vicinity and is gathered by execution of information acquisition processing 410 .
  • the wireless related information acquisition tables T 201 to T 203 exemplified in FIG. 7 consist of the information elements described below. Specifically, the wireless related information acquisition tables T 201 to T 203 store, in correlated form, access point devices and wireless terminals that have been wirelessly connected to these access point devices.
  • the wireless related information acquisition tables are stored and managed in the databases 403 by the wireless related information acquisition units 1101 installed in the topology information acquisition units 402 of the wireless terminals 116 to 118 .
  • FIG. 6 is a flowchart useful in describing processing for generating a wireless related information management table.
  • the management apparatus 111 and wireless terminals 116 to 118 communicate with each other utilizing the UPnP protocol after establishment of IP communication, which is a communication processing function.
  • the wireless terminals 116 to 118 are all associated with the access point device 112 , and communication between the wireless terminals 116 to 118 and the management apparatus 111 is carried out via the access point device 112 .
  • the controller 414 requests the topology information management unit 412 to execute message transmit processing, described below.
  • the topology information management unit 412 uses the message transceiver 1205 to transmit a wireless related information request message 301 (M 801 to M 803 in FIG. 3A ) to the wireless terminals 116 to 118 (S 902 ). As shown in FIG. 3A , messages M 801 , M 802 and M 803 are transmitted to the wireless surveillance camera 116 , wireless HDR 117 and wireless DVC 118 , respectively.
  • the controller 414 of the management apparatus 111 activates an answer-message receive timer for every wireless terminal (S 903 ) and transitions to a standby state in which it awaits reception of answer messages from the wireless terminals 116 to 118 (S 904 ).
  • FIG. 9 is a diagram exemplifying the format of an answer message.
  • FIG. 9 shown in FIG. 9 are an example of frame format 501 of the answer message to the management apparatus 111 from each of the wireless terminals 116 to 118 , and wireless related information 502 contained in a data frame of the answer message. The details of the information elements in the data frame will be described later.
  • Messages (M 804 to M 806 ) shown in FIG. 3A are answer messages transmitted from the wireless terminals 116 to 118 to the management apparatus 111 .
  • the wireless related information 502 includes a MAC address (STA MAC) E 601 of the wireless terminal; network identification information (SSID) E 602 of the currently associated access point device; a MAC address (BSSID) E 603 of the currently associated access point device; receive signal strength (RSSI) E 604 from the currently associated access point device; maximum bit rate (MAX PHYrate) E 605 at which communication is possible with the currently associated access point device; bit rate (Current DataRate) E 606 at which communication is being performed; data length (Length) of a list relating to a plurality of access point devices detected when the surrounding state of communication is scanned by the wireless terminals 116 to 118 ; and detailed data E 608 regarding the scan list, as described below.
  • the scan list E 608 is composed of information elements of detected access point devices other than the currently associated access point devices, and the details thereof are as follows:
  • the controller 404 of each of the wireless terminals 116 to 118 requests the topology information acquisition unit 402 to send back an answer message 503 that includes the wireless related information 502 .
  • the topology information acquisition unit 402 of each of the wireless terminals 116 to 118 executes the processing described below using the wireless related information generator 1100 .
  • the wireless related information generator 1100 generates the answer message 501 , which contains the wireless related information 502 , by referring to the wireless-related information elements in the wireless related information acquisition tables T 201 to T 203 . Further, the wireless related information generator 1100 of each of the wireless terminals 116 to 118 transmits the answer message 501 to the management apparatus 111 using the message transceiver 1103 .
  • the management apparatus 111 receives the message M 804 from the wireless surveillance camera 116 , the message M 805 from the wireless HDR 117 and the message M 806 from the wireless DVC 118 (“YES” at S 904 ). It should be noted that all of the answer messages M 804 to M 806 reach the management apparatus 111 by being relayed by the access point device 112 .
  • the controller 414 of the management apparatus 111 Upon receiving the answer messages, the controller 414 of the management apparatus 111 halts the receive timers corresponding to the respective wireless terminals (S 905 ).
  • the wireless related information 502 of the wireless terminals 116 to 118 is stored in the database 413 by the wireless related information management unit 1201 in the topology information management unit 412 of the management apparatus 111 (S 907 ).
  • the wireless related information management unit 1201 When the management apparatus 111 receives answer messages from all of the wireless terminals in the system (“YES” at S 908 ), the wireless related information management unit 1201 reads out the wireless related information 502 . The wireless related information management unit 1201 then constructs a wireless related information management table using the wireless related information 502 and stores the table in the database 413 (S 909 ) (A 821 ).
  • FIG. 8 is a diagram illustrating an example of a wireless related information management table T 504 generated by the management apparatus 111 .
  • the table T 504 is stored in the database 413 (storage unit) and is composed of the following information elements, by way of example:
  • the value of each item included in the wireless related information management table T 504 (a list of wireless base stations) is derived from the wireless related information 502 contained in the answer message 501 from each wireless terminal.
  • the wireless related information management table is stored in the database 413 and managed by the wireless related information management unit 1201 installed in the topology information management unit 412 of the management apparatus 111 .
  • the access point devices are stored in correlation with the wireless terminals associated with these access point devices.
  • a list of access point devices that are candidates for management are obtained from the wireless related information management table T 504 generated as described above.
  • the wireless related information management table T 504 also contains an access point device (here AP 114 ) that is not under the management of the management apparatus 111 . It should be noted that it is possible to determine that the access point device that has relayed the answer messages from the wireless terminals 116 to 118 to the management apparatus 111 , i.e., the access point device with which the wireless terminals 116 to 118 are associated, is under the management of the management apparatus 111 . With this method alone, however, there is an access point device (here AP 113 ) which, despite the fact that it is under the management of the management apparatus 111 , is erroneously determined not to be under the management of the management apparatus 111 .
  • an access point device that is not under management is determined by issuing a request for an answer message that has passed through each access point device contained in the wireless related information management table T 504 .
  • FIG. 10 is a flowchart useful in describing processing for updating the wireless related information management table. This processing is executed by the management apparatus 111 based upon the information in the wireless related information management table T 504 already generated.
  • the management information analyzer 1202 installed in the topology information management unit 412 investigates the wireless related information management table T 504 and searches for any access point having no history of being associated with even a single wireless terminal. In other words, the management information analyzer 1202 searches for an access point device with which an associated wireless terminal has not been correlated. Then, if the result of the analysis by the management information analyzer 1202 of topology information management unit 412 is that an unassociated access point device does not exist (“NO” at S 1001 ), processing is exited.
  • the wireless terminal selector 1203 of the topology information management unit 412 selects a wireless terminal that is caused to be associated with this access point device based upon the wireless related information management table T 504 (S 1002 ).
  • the arrangement adopted is such that a wireless terminal having a higher RSSI value is selected with respect to the access point devices detected in the system and registered in the wireless related information management table T 504 .
  • the wireless DVC 118 which has a higher RSSI value, is selected as the wireless terminal associated with the access point device 113 .
  • the wireless surveillance camera 116 which has a higher RSSI value, is selected as the wireless terminal associated with the access point device 114 .
  • the wireless terminal having the next higher RSSI value is selected from among the wireless terminals capable of being associated with the applicable access point device (S 1002 ).
  • the management apparatus 111 thenceforth requests the operations (1) and (2) below of the applicable wireless terminal. In other words, the management apparatus 111 specifies data transmission via an access point device having no history of association.
  • the controller 414 of the management apparatus 111 activates the answer-message receive timer [wireless surveillance camera 116 : T 1 .S (A 822 )/wireless DVC 118 : T 2 .S (A 823 )] for every wireless terminal (S 1005 ).
  • the controller 414 of the management apparatus 111 then transitions to the standby state in which it waits for answer messages from the wireless terminals 116 and 118 (S 1006 ).
  • FIG. 11 is a diagram useful in describing transmission of the wireless related information answer message in the wireless communication system.
  • a group of messages 701 are messages (M 808 , M 810 ) transmitted by the management apparatus 111 selecting the wireless terminals 116 and 118 from among the wireless terminals 116 to 118 .
  • a message 702 is in response to message 701 .
  • This is a message (M 809 ) transmitted by the wireless surveillance camera 116 after it is associated (M 808 ) with the access point device 114 .
  • a message 703 is in response to message 701 .
  • the controller 404 of the wireless surveillance camera 116 that has received the wireless related information request message (M 807 ) executes processing (M 808 ) to associate itself with the access point device 114 . If the association processing (M 808 ) is incomplete or has failed, the controller 404 of the wireless surveillance camera 116 terminates processing for sending back the answer message to the management apparatus 111 . If the association processing (M 808 ) is completed, then the controller 404 sends the wireless related information answer message (M 809 ) back to the management apparatus 111 via the access point device 114 .
  • the management apparatus 111 Since the access point device 114 is connected to the network 103 , which is different from the network 100 being managed by the management apparatus 111 , the answer message 702 does not arrive at the management apparatus 111 (A 825 ). Accordingly, the management apparatus 111 is incapable of receiving the wireless related information answer message M 809 from the wireless surveillance camera 116 (“NO” at S 1006 ) and the answer-message receive timer times out (T 1 .O) (A 828 ) (“YES” at S 1008 ).
  • the wireless related information management unit 1201 updates (deletes in this case) the information relating to the access point device 114 in the wireless related information management table T 504 stored in database 413 (S 1009 ) (A 829 ).
  • the controller 404 of the wireless DVC 118 executes processing (M 811 ) for associating itself with the access point device 113 . If the association processing (M 811 ) is incomplete or has failed, the controller 404 of the wireless DVC 118 terminates processing for sending back the answer message to the management apparatus 111 . If the association processing (M 811 ) is completed, then the controller 404 sends the wireless related information answer message (M 812 ), which is the answer message 703 , back to the management apparatus 111 via the access point device 113 .
  • the answer message 703 is capable of being received by the management apparatus 111 via the access point device 113 (A 824 ).
  • the controller 414 of the management apparatus 111 that has received the wireless related information answer message (M 812 ) stops the answer-message receive timer (T 2 .C) (A 826 ) (S 1007 ).
  • the wireless related information management unit 1201 updates the information relating to the access point device 113 in the wireless related information management table T 504 stored in database 413 (S 1009 ) (A 827 ).
  • the device identification unit 1204 of the management apparatus 111 identifies the access point device not under management. That is, the access point device 114 that has not relayed the answer message to the management apparatus 111 is identified as the access point device that is not under management. Further, the access point device 113 that has relayed the answer message to the management apparatus 111 is identified as the access point device that is under management. Further, it may be so arranged that a topology determination of the network is performed. It may be arranged so that the communication band used by the access point device under management is controlled based upon the topology determined.
  • the management apparatus 111 executes the processing of S 1002 to S 1009 repeatedly until a prescribed command is completed with respect to all wireless communication terminals selectable in the system (“NO” at S 1010 ).
  • the wireless related information management unit 1201 reconfigures ( 704 in FIG. 12 ) the wireless relating information of every access point device in the wireless related information management table T 504 .
  • FIG. 12 is a diagram illustrating an example of the wireless related information management table after updating.
  • FIG. 12 illustrates a state in which the access point device whose SSID is “AP 3 ”, namely the access point device 114 , has been deleted.
  • the controller 414 of the management apparatus 111 when the controller 414 of the management apparatus 111 has detected establishment of IP communication, the controller requests the topology information management unit 412 to transmit the message 301 .
  • the wireless related information updating unit 1102 of the topology information management unit 412 transmits the message 301 to the communication terminals 115 to 118 periodically (at fixed intervals).
  • the processing (S 1001 to S 1010 ) for updating the wireless related information management table T 504 in the management apparatus 111 is executed repeatedly.
  • a request to transmit an answer message that has passed through an access point device with which a wireless terminal is not associated is issued in order from this access point device from the wireless terminal having the high RSSI.
  • the answer-message transmit request is not issued to all wireless terminals that are capable of detecting this access point device. The reason is that at the moment an answer message from a single wireless terminal could be received, it can be determined that the access point device that relayed this answer message is an access point device that is subject to management by the management apparatus.
  • a terminal under management (or one not under management) can be identified even in a network that includes wireless devices that do not support various discovery protocols such as UPnP, LLDP and LLTD.
  • UPnP UPnP
  • LLDP LLDP
  • LLTD LLTD
  • aspects of the present invention can also be realized by a computer of a system or apparatus (or devices such as a CPU or MPU) that reads out and executes a program recorded on a memory device to perform the functions of the above-described embodiment(s), and by a method, the steps of which are performed by a computer of a system or apparatus by, for example, reading out and executing a program recorded on a memory device to perform the functions of the above-described embodiment(s).
  • the program is provided to the computer for example via a network or from a recording medium of various types serving as the memory device (e.g., computer-readable medium).

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